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from django.db import models
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from boards import utils
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from boards.models.attachment.viewers import get_viewers, AbstractViewer
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from boards.utils import get_upload_filename, get_file_mimetype, get_extension
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class AttachmentManager(models.Manager):
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def create_with_hash(self, file):
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file_hash = utils.get_file_hash(file)
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existing = self.filter(hash=file_hash)
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if len(existing) > 0:
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attachment = existing[0]
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else:
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# FIXME Use full mimetype here, need to modify viewers too
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file_type = get_extension(file.name)
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attachment = self.create(file=file, mimetype=file_type,
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hash=file_hash)
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return attachment
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class Attachment(models.Model):
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objects = AttachmentManager()
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file = models.FileField(upload_to=get_upload_filename)
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mimetype = models.CharField(max_length=50)
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hash = models.CharField(max_length=36)
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def get_view(self):
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file_viewer = None
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for viewer in get_viewers():
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if viewer.supports(self.mimetype):
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file_viewer = viewer
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break
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if file_viewer is None:
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file_viewer = AbstractViewer
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return file_viewer(self.file, self.mimetype).get_view()
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